using System;
using System.Linq;
namespace Unihan
{
	public class Uni
	{
		static readonly IntSpan[] BlockLookup;

		static Uni ()
		{
			#region static data
			int[] spans = { 0x0000, 0x007F, 0x0080, 0x00FF, 0x0100, 0x017F, 0x0180, 0x024F, 0x0250, 0x02AF,
			0x02B0, 0x02FF, 0x0300, 0x036F, 0x0370, 0x03FF, 0x0400, 0x04FF, 0x0500, 0x052F,
			0x0530, 0x058F, 0x0590, 0x05FF, 0x0600, 0x06FF, 0x0700, 0x074F, 0x0750, 0x077F,
			0x0780, 0x07BF, 0x07C0, 0x07FF, 0x0800, 0x083F, 0x0840, 0x085F, 0x0900, 0x097F,
			0x0980, 0x09FF, 0x0A00, 0x0A7F, 0x0A80, 0x0AFF, 0x0B00, 0x0B7F, 0x0B80, 0x0BFF,
			0x0C00, 0x0C7F, 0x0C80, 0x0CFF, 0x0D00, 0x0D7F, 0x0D80, 0x0DFF, 0x0E00, 0x0E7F,
			0x0E80, 0x0EFF, 0x0F00, 0x0FFF, 0x1000, 0x109F, 0x10A0, 0x10FF, 0x1100, 0x11FF,
			0x1200, 0x137F, 0x1380, 0x139F, 0x13A0, 0x13FF, 0x1400, 0x167F, 0x1680, 0x169F,
			0x16A0, 0x16FF, 0x1700, 0x171F, 0x1720, 0x173F, 0x1740, 0x175F, 0x1760, 0x177F,
			0x1780, 0x17FF, 0x1800, 0x18AF, 0x18B0, 0x18FF, 0x1900, 0x194F, 0x1950, 0x197F,
			0x1980, 0x19DF, 0x19E0, 0x19FF, 0x1A00, 0x1A1F, 0x1A20, 0x1AAF, 0x1B00, 0x1B7F,
			0x1B80, 0x1BBF, 0x1BC0, 0x1BFF, 0x1C00, 0x1C4F, 0x1C50, 0x1C7F, 0x1CD0, 0x1CFF,
			0x1D00, 0x1D7F, 0x1D80, 0x1DBF, 0x1DC0, 0x1DFF, 0x1E00, 0x1EFF, 0x1F00, 0x1FFF,
			0x2000, 0x206F, 0x2070, 0x209F, 0x20A0, 0x20CF, 0x20D0, 0x20FF, 0x2100, 0x214F,
			0x2150, 0x218F, 0x2190, 0x21FF, 0x2200, 0x22FF, 0x2300, 0x23FF, 0x2400, 0x243F,
			0x2440, 0x245F, 0x2460, 0x24FF, 0x2500, 0x257F, 0x2580, 0x259F, 0x25A0, 0x25FF,
			0x2600, 0x26FF, 0x2700, 0x27BF, 0x27C0, 0x27EF, 0x27F0, 0x27FF, 0x2800, 0x28FF,
			0x2900, 0x297F, 0x2980, 0x29FF, 0x2A00, 0x2AFF, 0x2B00, 0x2BFF, 0x2C00, 0x2C5F,
			0x2C60, 0x2C7F, 0x2C80, 0x2CFF, 0x2D00, 0x2D2F, 0x2D30, 0x2D7F, 0x2D80, 0x2DDF,
			0x2DE0, 0x2DFF, 0x2E00, 0x2E7F, 0x2E80, 0x2EFF, 0x2F00, 0x2FDF, 0x2FF0, 0x2FFF,
			0x3000, 0x303F, 0x3040, 0x309F, 0x30A0, 0x30FF, 0x3100, 0x312F, 0x3130, 0x318F,
			0x3190, 0x319F, 0x31A0, 0x31BF, 0x31C0, 0x31EF, 0x31F0, 0x31FF, 0x3200, 0x32FF,
			0x3300, 0x33FF, 0x3400, 0x4DBF, 0x4DC0, 0x4DFF, 0x4E00, 0x9FFF, 0xA000, 0xA48F,
			0xA490, 0xA4CF, 0xA4D0, 0xA4FF, 0xA500, 0xA63F, 0xA640, 0xA69F, 0xA6A0, 0xA6FF,
			0xA700, 0xA71F, 0xA720, 0xA7FF, 0xA800, 0xA82F, 0xA830, 0xA83F, 0xA840, 0xA87F,
			0xA880, 0xA8DF, 0xA8E0, 0xA8FF, 0xA900, 0xA92F, 0xA930, 0xA95F, 0xA960, 0xA97F,
			0xA980, 0xA9DF, 0xAA00, 0xAA5F, 0xAA60, 0xAA7F, 0xAA80, 0xAADF, 0xAB00, 0xAB2F,
			0xABC0, 0xABFF, 0xAC00, 0xD7AF, 0xD7B0, 0xD7FF, 0xD800, 0xDB7F, 0xDB80, 0xDBFF,
			0xDC00, 0xDFFF, 0xE000, 0xF8FF, 0xF900, 0xFAFF, 0xFB00, 0xFB4F, 0xFB50, 0xFDFF,
			0xFE00, 0xFE0F, 0xFE10, 0xFE1F, 0xFE20, 0xFE2F, 0xFE30, 0xFE4F, 0xFE50, 0xFE6F,
			0xFE70, 0xFEFF, 0xFF00, 0xFFEF, 0xFFF0, 0xFFFF, 0x10000, 0x1007F, 0x10080, 0x100FF,
			0x10100, 0x1013F, 0x10140, 0x1018F, 0x10190, 0x101CF, 0x101D0, 0x101FF, 0x10280, 0x1029F,
			0x102A0, 0x102DF, 0x10300, 0x1032F, 0x10330, 0x1034F, 0x10380, 0x1039F, 0x103A0, 0x103DF,
			0x10400, 0x1044F, 0x10450, 0x1047F, 0x10480, 0x104AF, 0x10800, 0x1083F, 0x10840, 0x1085F,
			0x10900, 0x1091F, 0x10920, 0x1093F, 0x10A00, 0x10A5F, 0x10A60, 0x10A7F, 0x10B00, 0x10B3F,
			0x10B40, 0x10B5F, 0x10B60, 0x10B7F, 0x10C00, 0x10C4F, 0x10E60, 0x10E7F, 0x11000, 0x1107F,
			0x11080, 0x110CF, 0x12000, 0x123FF, 0x12400, 0x1247F, 0x13000, 0x1342F, 0x16800, 0x16A3F,
			0x1B000, 0x1B0FF, 0x1D000, 0x1D0FF, 0x1D100, 0x1D1FF, 0x1D200, 0x1D24F, 0x1D300, 0x1D35F,
			0x1D360, 0x1D37F, 0x1D400, 0x1D7FF, 0x1F000, 0x1F02F, 0x1F030, 0x1F09F, 0x1F0A0, 0x1F0FF,
			0x1F100, 0x1F1FF, 0x1F200, 0x1F2FF, 0x1F300, 0x1F5FF, 0x1F600, 0x1F64F, 0x1F680, 0x1F6FF,
			0x1F700, 0x1F77F, 0x20000, 0x2A6DF, 0x2A700, 0x2B73F, 0x2B740, 0x2B81F, 0x2F800, 0x2FA1F,
			0xE0000, 0xE007F, 0xE0100, 0xE01EF, 0xF0000, 0xFFFFF, 0x100000, 0x10FFFF };
			#endregion
			BlockLookup = new IntSpan[spans.Length / 2];
			for (int i = 0; i < BlockLookup.Length; i++)
			{
				BlockLookup[i] = new IntSpan (spans[i * 2], spans[i * 2 + 1]);
			}
			
		}
		
		static public UniBlock BlockOf(char ch)
		{
			return BlockOf(new CodePoint(ch));
		}
		
		static public UniBlock BlockOf(CodePoint codePoint)
		{
			return BlockOf(codePoint.Scalar);
			
		}
		static public UniBlock BlockOf(int scalar)
		{
			int idx  = Array.FindIndex(BlockLookup,span=>span.Covered(scalar));
			return idx >= 0 ? (UniBlock)idx : UniBlock.Undefined;
		}
		static public IntSpan SpanOf(UniBlock ub)
		{
			try
			{
				int idx = (int)ub;
				return BlockLookup[idx];
			}
			catch (Exception ex)
			{
				throw new ArgumentOutOfRangeException("Invalid unicode block");
			}
		}
	}
}

